mcs/class/System.Data/Mainsoft.Data.Configuration.jvm/ProvidersSectionHandler.cs

   1 //
   2 // System.Data.OleDb.OleDbConnection
   3 //
   4 // Authors:
   5 //      Konstantin Triger <kostat@mainsoft.com>
   6 //      Boris Kirzner <borisk@mainsoft.com>
   7 //
   8 // (C) 2006 Mainsoft Corporation (http://www.mainsoft.com)
   9 //
  10
  11 //
  12 // Permission is hereby granted, free of charge, to any person obtaining
  13 // a copy of this software and associated documentation files (the
  14 // "Software"), to deal in the Software without restriction, including
  15 // without limitation the rights to use, copy, modify, merge, publish,
  16 // distribute, sublicense, and/or sell copies of the Software, and to
  17 // permit persons to whom the Software is furnished to do so, subject to
  18 // the following conditions:
  19 //
  20 // The above copyright notice and this permission notice shall be
  21 // included in all copies or substantial portions of the Software.
  22 //
  23 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  27 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  28 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  29 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  30 //
  31
  32
  33 using System;
  34 using System.Configuration;
  35 using System.Xml;
  36 using System.Collections;
  37 using System.Collections.Specialized;
  38
  39 namespace Mainsoft.Data.Configuration
  40 {
  41         class ProvidersSectionHandler : IConfigurationSectionHandler
  42         {
  43                 public virtual object Create (object parent, object configContext, XmlNode section) {
  44                         if (section.Attributes != null && section.Attributes.Count != 0)
  45                                 ThrowException ("Unrecognized attribute", section);
  46
  47                         ArrayList providers = new ArrayList();
  48
  49                         XmlNodeList providerElements = section.SelectNodes ("provider");
  50                         foreach (XmlNode child in providerElements) {
  51                                 XmlNodeType ntype = child.NodeType;
  52                                 if (ntype == XmlNodeType.Whitespace || ntype == XmlNodeType.Comment)
  53                                         continue;
  54
  55                                 if (ntype != XmlNodeType.Element)
  56                                         ThrowException ("Only elements allowed", child);
  57
  58                                 object parentProvider = null;
  59                                 XmlAttribute extends = child.Attributes["parent"];
  60                                 if (extends != null) {
  61                                         string super = extends.Value;
  62                                         string sectionName = super.Substring(0, super.IndexOf('#'));
  63                                         string id = super.Substring(sectionName.Length+1);
  64                                         IList supers = (IList) ConfigurationSettings.GetConfig(sectionName);
  65                                         for (int i = 0; i < supers.Count; i++) {
  66                                                 Hashtable ht = (Hashtable)supers[i];
  67                                                 string curId = (string)ht["id"];
  68                                                 if (String.CompareOrdinal(id,curId) == 0) {
  69                                                         parentProvider = ht;
  70                                                         break;
  71                                                 }
  72                                         }
  73                                         child.Attributes.Remove(extends);
  74                                 }
  75
  76                                 DictionarySectionHandler handler = new DictionarySectionHandler();
  77                                 Hashtable col = (Hashtable) handler.Create (parentProvider, null, child);
  78                                 providers.Add(col);
  79                         }
  80                         if (parent != null && parent is IList) {
  81                                 IList parentList = (IList)parent;
  82                                 for (int i = 0; i < parentList.Count; i++) {
  83                                         Hashtable htParent = (Hashtable)parentList[i];
  84                                         string parentId = (string)htParent["id"];
  85                                         bool overriden = false;
  86                                         for (int y = 0; y < providers.Count; y++) {
  87                                                 Hashtable htMe = (Hashtable)providers[y];
  88                                                 string myId = (string)htMe["id"];
  89                                                 if (String.CompareOrdinal(parentId,myId) == 0) {
  90                                                         overriden = true;
  91                                                         foreach (object key in htParent.Keys)
  92                                                                 if (!htMe.ContainsKey(key))
  93                                                                         htMe[key] = htParent[key];
  94                                                         break;
  95                                                 }
  96                                         }
  97
  98                                         if (!overriden)
  99                                                 providers.Add(htParent);
 100                                 }
 101                         }
 102
 103                         return providers;
 104                 }
 105
 106                 static internal void ThrowException (string msg, XmlNode node)
 107                 {
 108                         if (node != null && node.Name != String.Empty)
 109                                 msg = msg + " (node name: " + node.Name + ") ";
 110                         throw new ConfigurationException (msg, node);
 111                 }
 112         }
 113 }